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Routh PK, Redekop E, Prodinger S, van der Hoeven JES, Lim KRG, Aizenberg J, Nachtegaal M, Clark AH, Frenkel AI. Restructuring dynamics of surface species in bimetallic nanoparticles probed by modulation excitation spectroscopy. Nat Commun 2024; 15:6736. [PMID: 39112484 PMCID: PMC11306641 DOI: 10.1038/s41467-024-51068-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2024] [Accepted: 07/29/2024] [Indexed: 08/10/2024] Open
Abstract
Restructuring of metal components on bimetallic nanoparticle surfaces in response to the changes in reactive environment is a ubiquitous phenomenon whose potential for the design of tunable catalysts is underexplored. The main challenge is the lack of knowledge of the structure, composition, and evolution of species on the nanoparticle surfaces during reaction. We apply a modulation excitation approach to the X-ray absorption spectroscopy of the 30 atomic % Pd in Au supported nanocatalysts via the gas (H2 and O2) concentration modulation. For interpreting restructuring kinetics, we correlate the phase-sensitive detection with the time-domain analysis aided by a denoising algorithm. Here we show that the surface and near-surface species such as Pd oxides and atomically dispersed Pd restructured periodically, featuring different time delays. We propose a model that Pd oxide formation is preceded by the build-up of Pd regions caused by oxygen-driven segregation of Pd atoms towards the surface. During the H2 pulse, rapid reduction and dissolution of Pd follows an induction period which we attribute to H2 dissociation. Periodic perturbations of nanocatalysts by gases can, therefore, enable variations in the stoichiometry of the surface and near-surface oxides and dynamically tune the degree of oxidation/reduction of metals at/near the catalyst surface.
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Affiliation(s)
- Prahlad K Routh
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, NY, 11794, USA
| | - Evgeniy Redekop
- Centre for Materials Science and Nanotechnology (SMN), Department of Chemistry, University of Oslo, N-0315, Oslo, Norway
| | - Sebastian Prodinger
- Centre for Materials Science and Nanotechnology (SMN), Department of Chemistry, University of Oslo, N-0315, Oslo, Norway
| | - Jessi E S van der Hoeven
- Materials Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, 3584 CG, Utrecht, The Netherlands
| | - Kang Rui Garrick Lim
- Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, 02138, USA
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, 02138, USA
| | - Joanna Aizenberg
- Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, 02138, USA
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, 02138, USA
| | | | - Adam H Clark
- Paul Scherrer Institut (PSI), Villigen, CH-5232, Switzerland
| | - Anatoly I Frenkel
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, NY, 11794, USA.
- Division of Chemistry, Brookhaven National Laboratory, Upton, NY, 11973, USA.
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2
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Wang C, Wang Z, Mao S, Chen Z, Wang Y. Coordination environment of active sites and their effect on catalytic performance of heterogeneous catalysts. CHINESE JOURNAL OF CATALYSIS 2022. [DOI: 10.1016/s1872-2067(21)63924-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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4
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Timoshenko J, Roldan Cuenya B. In Situ/ Operando Electrocatalyst Characterization by X-ray Absorption Spectroscopy. Chem Rev 2021; 121:882-961. [PMID: 32986414 PMCID: PMC7844833 DOI: 10.1021/acs.chemrev.0c00396] [Citation(s) in RCA: 205] [Impact Index Per Article: 68.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Indexed: 12/18/2022]
Abstract
During the last decades, X-ray absorption spectroscopy (XAS) has become an indispensable method for probing the structure and composition of heterogeneous catalysts, revealing the nature of the active sites and establishing links between structural motifs in a catalyst, local electronic structure, and catalytic properties. Here we discuss the fundamental principles of the XAS method and describe the progress in the instrumentation and data analysis approaches undertaken for deciphering X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) spectra. Recent usages of XAS in the field of heterogeneous catalysis, with emphasis on examples concerning electrocatalysis, will be presented. The latter is a rapidly developing field with immense industrial applications but also unique challenges in terms of the experimental characterization restrictions and advanced modeling approaches required. This review will highlight the new insight that can be gained with XAS on complex real-world electrocatalysts including their working mechanisms and the dynamic processes taking place in the course of a chemical reaction. More specifically, we will discuss applications of in situ and operando XAS to probe the catalyst's interactions with the environment (support, electrolyte, ligands, adsorbates, reaction products, and intermediates) and its structural, chemical, and electronic transformations as it adapts to the reaction conditions.
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Affiliation(s)
- Janis Timoshenko
- Department of Interface Science, Fritz-Haber Institute of the Max-Planck Society, 14195 Berlin, Germany
| | - Beatriz Roldan Cuenya
- Department of Interface Science, Fritz-Haber Institute of the Max-Planck Society, 14195 Berlin, Germany
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5
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Bergmann A, Roldan Cuenya B. Operando Insights into Nanoparticle Transformations during Catalysis. ACS Catal 2019. [DOI: 10.1021/acscatal.9b01831] [Citation(s) in RCA: 73] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Arno Bergmann
- Department of Interface Science, Fritz-Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
| | - Beatriz Roldan Cuenya
- Department of Interface Science, Fritz-Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
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6
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Rizo R, Roldan Cuenya B. Shape-Controlled Nanoparticles as Anodic Catalysts in Low-Temperature Fuel Cells. ACS ENERGY LETTERS 2019; 4:1484-1495. [PMID: 31259247 PMCID: PMC6591768 DOI: 10.1021/acsenergylett.9b00565] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Accepted: 05/15/2019] [Indexed: 05/28/2023]
Abstract
The great dependence of the electrocatalytic activity of most electrochemical reactions on the catalytic surface area and specific surface structure is widely accepted. Building on the extensive knowledge already available on single-crystal surfaces, this Perspective discusses the recent progress made in low-temperature fuel cells through the use of the most active shape-controlled noble metal-based nanoparticles. In particular, we will focus on discussing structure-composition-reactivity correlations in methanol, ethanol, and formic acid oxidation reactions and will offer a general vision of future needs.
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7
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Li G, Chen L, Fan R, Liu D, Chen S, Li X, Chung KH. Catalytic deoxygenation of C18 fatty acid over supported metal Ni catalysts promoted by the basic sites of ZnAl2O4 spinel phase. Catal Sci Technol 2019. [DOI: 10.1039/c8cy02027b] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
The supports with various amounts of Zn–Al spinel were synthesized to test catalytic deoxygenation activity of fatty acids, which show that spinel phase increased the basic strength of the catalyst, resulting in a high selectivity to hydrocarbons.
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Affiliation(s)
- Guangci Li
- Key Laboratory of Biofuels
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao 266101
- P.R. China
| | - Lei Chen
- Key Laboratory of Biofuels
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao 266101
- P.R. China
| | - Ruikun Fan
- Key Laboratory of Biofuels
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao 266101
- P.R. China
| | - Di Liu
- College of Chemical and Environmental Engineering
- Shandong University of Science and Technology
- Qingdao 266590
- P.R. China
| | - Song Chen
- Key Laboratory of Biofuels
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao 266101
- P.R. China
| | - Xuebing Li
- Key Laboratory of Biofuels
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao 266101
- P.R. China
| | - Keng H. Chung
- Key Laboratory of Biofuels
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao 266101
- P.R. China
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8
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Silva TR, de Oliveira DC, Pal T, Domingos JB. The catalytic evaluation of bimetallic Pd-based nanocatalysts supported on ion exchange resin in nitro and alkyne reduction reactions. NEW J CHEM 2019. [DOI: 10.1039/c9nj00285e] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A simple protocol to produce bimetallic Pd-based nanocatalysts supported on Amberlite resin is presented. Superior catalytic activity and selectivity in nitro and alkyne reduction reactions was achieved, opening up new possibilities in the development of cheaper and selective catalysts for these important industrial reactions.
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Affiliation(s)
- Tábata R. Silva
- LaCBio – Laboratory of Biomimetic Catalysis
- Department of Chemistry
- Federal University of Santa Catarina
- Florianópolis – SC
- Brazil
| | | | - Tarasankar Pal
- Department of Chemistry
- Indian Institute of Technology
- Kharagpur
- India
| | - Josiel B. Domingos
- LaCBio – Laboratory of Biomimetic Catalysis
- Department of Chemistry
- Federal University of Santa Catarina
- Florianópolis – SC
- Brazil
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9
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Soldatov MA, Martini A, Bugaev AL, Pankin I, Medvedev PV, Guda AA, Aboraia AM, Podkovyrina YS, Budnyk AP, Soldatov AA, Lamberti C. The insights from X-ray absorption spectroscopy into the local atomic structure and chemical bonding of Metal–organic frameworks. Polyhedron 2018. [DOI: 10.1016/j.poly.2018.08.004] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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10
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Smirnov MY, Vovk EI, Kalinkin AV, Simonov PA, Gerasimov EY, Bukhtiyarov VI. Formation of Surface Platinum Oxides in the Interaction of the Pt/Sibunit Catalysts with NO2: Estimates of the Width of Oxide Shell from XPS Data. KINETICS AND CATALYSIS 2018. [DOI: 10.1134/s0023158418050130] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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11
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Zhu Y, Cao T, Cao C, Luo J, Chen W, Zheng L, Dong J, Zhang J, Han Y, Li Z, Chen C, Peng Q, Wang D, Li Y. One-Pot Pyrolysis to N-Doped Graphene with High-Density Pt Single Atomic Sites as Heterogeneous Catalyst for Alkene Hydrosilylation. ACS Catal 2018. [DOI: 10.1021/acscatal.8b02624] [Citation(s) in RCA: 81] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Youqi Zhu
- Department of Chemistry, Tsinghua University, Beijing 100084, China
- Research Center of Materials Science, Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, Beijing Institute of Technology, Beijing 100081, China
| | - Tai Cao
- Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Chuanbao Cao
- Research Center of Materials Science, Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, Beijing Institute of Technology, Beijing 100081, China
| | - Jun Luo
- Center for Electron Microscopy, Tianjin University of Technology, Tianjin 300384, China
| | - Wenxing Chen
- Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Lirong Zheng
- Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Juncai Dong
- Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Jian Zhang
- Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Yunhu Han
- Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Zhi Li
- Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Chen Chen
- Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Qing Peng
- Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Dingsheng Wang
- Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Yadong Li
- Department of Chemistry, Tsinghua University, Beijing 100084, China
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12
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Timoshenko J, Lu D, Lin Y, Frenkel AI. Supervised Machine-Learning-Based Determination of Three-Dimensional Structure of Metallic Nanoparticles. J Phys Chem Lett 2017; 8:5091-5098. [PMID: 28960990 DOI: 10.1021/acs.jpclett.7b02364] [Citation(s) in RCA: 122] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Tracking the structure of heterogeneous catalysts under operando conditions remains a challenge due to the paucity of experimental techniques that can provide atomic-level information for catalytic metal species. Here we report on the use of X-ray absorption near-edge structure (XANES) spectroscopy and supervised machine learning (SML) for refining the 3D geometry of metal catalysts. SML is used to unravel the hidden relationship between the XANES features and catalyst geometry. To train our SML method, we rely on ab initio XANES simulations. Our approach allows one to solve the structure of a metal catalyst from its experimental XANES, as demonstrated here by reconstructing the average size, shape, and morphology of well-defined platinum nanoparticles. This method is applicable to the determination of the nanoparticle structure in operando studies and can be generalized to other nanoscale systems. It also allows on-the-fly XANES analysis and is a promising approach for high-throughput and time-dependent studies.
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Affiliation(s)
- Janis Timoshenko
- Department of Material Science and Chemical Engineering, Stony Brook University , Stony Brook, New York 11794, United States
| | - Deyu Lu
- Center for Functional Nanomaterials, Brookhaven National Laboratory , Upton, New York 11973, United States
| | - Yuewei Lin
- Computational Science Initiative, Brookhaven National Laboratory , Upton, New York 11973, United States
| | - Anatoly I Frenkel
- Department of Material Science and Chemical Engineering, Stony Brook University , Stony Brook, New York 11794, United States
- Division of Chemistry, Brookhaven National Laboratory , Upton, New York 11973, United States
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13
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Chen H, He S, Xu M, Wei M, Evans DG, Duan X. Promoted Synergic Catalysis between Metal Ni and Acid–Base Sites toward Oxidant-Free Dehydrogenation of Alcohols. ACS Catal 2017. [DOI: 10.1021/acscatal.6b03494] [Citation(s) in RCA: 98] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hao Chen
- State Key Laboratory
of Chemical
Resource Engineering, Beijing Advanced Innovation Center for Soft
Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
| | - Shan He
- State Key Laboratory
of Chemical
Resource Engineering, Beijing Advanced Innovation Center for Soft
Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
| | - Ming Xu
- State Key Laboratory
of Chemical
Resource Engineering, Beijing Advanced Innovation Center for Soft
Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
| | - Min Wei
- State Key Laboratory
of Chemical
Resource Engineering, Beijing Advanced Innovation Center for Soft
Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
| | - David G. Evans
- State Key Laboratory
of Chemical
Resource Engineering, Beijing Advanced Innovation Center for Soft
Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
| | - Xue Duan
- State Key Laboratory
of Chemical
Resource Engineering, Beijing Advanced Innovation Center for Soft
Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
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14
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Choi Y, Sinev I, Mistry H, Zegkinoglou I, Roldan Cuenya B. Probing the Dynamic Structure and Chemical State of Au Nanocatalysts during the Electrochemical Oxidation of 2-Propanol. ACS Catal 2016. [DOI: 10.1021/acscatal.6b00057] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Y. Choi
- Department
of Physics, Ruhr University Bochum, 44780 Bochum, Germany
| | - I. Sinev
- Department
of Physics, Ruhr University Bochum, 44780 Bochum, Germany
| | - H. Mistry
- Department
of Physics, Ruhr University Bochum, 44780 Bochum, Germany
- Department
of Physics, University of Central Florida, Orlando, Florida 32816, United States
| | - I. Zegkinoglou
- Department
of Physics, Ruhr University Bochum, 44780 Bochum, Germany
| | - B. Roldan Cuenya
- Department
of Physics, Ruhr University Bochum, 44780 Bochum, Germany
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15
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He Y, Zhao P, Guo W, Yang Y, Huo CF, Li YW, Wen XD. Hägg carbide surfaces induced Pt morphological changes: a theoretical insight. Catal Sci Technol 2016. [DOI: 10.1039/c6cy00764c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Comprehensive spin-polarized density functional theory (DFT) combined with ab initio molecular dynamic (AIMD) simulations have been performed to explore the structures, energies, and diffusion behavior of platinum on Fe5C2 surfaces with importance in Fischer–Tropsch (F–T) catalysis.
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Affiliation(s)
- Yurong He
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan
- China
| | - Peng Zhao
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan
- China
| | - Wenping Guo
- National Energy Center for Coal to Liquids
- Synfuels China Co., Ltd
- Beijing
- China
| | - Yong Yang
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan
- China
| | - Chun-Fang Huo
- National Energy Center for Coal to Liquids
- Synfuels China Co., Ltd
- Beijing
- China
| | - Yong-Wang Li
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan
- China
| | - Xiao-Dong Wen
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan
- China
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16
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Hellinger M, Carvalho HWPD, Baier S, Gharnati L, Grunwaldt JD. Solvent Influence on the Hydrodeoxygenation of Guaiacol over Pt/SiO2and Pt/H-MFI 90 Catalysts. CHEM-ING-TECH 2015. [DOI: 10.1002/cite.201500143] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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17
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Garino C, Borfecchia E, Gobetto R, van Bokhoven JA, Lamberti C. Determination of the electronic and structural configuration of coordination compounds by synchrotron-radiation techniques. Coord Chem Rev 2014. [DOI: 10.1016/j.ccr.2014.03.027] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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18
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Lira E, Merte LR, Behafarid F, Ono LK, Zhang L, Roldan Cuenya B. Role and Evolution of Nanoparticle Structure and Chemical State during the Oxidation of NO over Size- and Shape-Controlled Pt/γ-Al2O3 Catalysts under Operando Conditions. ACS Catal 2014. [DOI: 10.1021/cs500137r] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- E. Lira
- Department
of Physics, University of Central Florida, Orlando, Florida 32816, United States
| | - L. R. Merte
- Department
of Physics, University of Central Florida, Orlando, Florida 32816, United States
| | - F. Behafarid
- Department
of Physics, University of Central Florida, Orlando, Florida 32816, United States
| | - L. K. Ono
- Department
of Physics, University of Central Florida, Orlando, Florida 32816, United States
| | - L. Zhang
- Center
for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - B. Roldan Cuenya
- Department
of Physics, Ruhr University Bochum, 44780 Bochum, Germany
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19
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Du Q, Wu J, Yang H. Pt@Nb-TiO2 Catalyst Membranes Fabricated by Electrospinning and Atomic Layer Deposition. ACS Catal 2013. [DOI: 10.1021/cs400944p] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Qing Du
- Department of Chemical Engineering, University of Rochester, Rochester, New York 14627, United States
| | - Jianbo Wu
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana−Champaign, 114 Roger Adams Laboratory, MC-712, 600 S. Mathews
Avenue, Urbana, Illinois 61801, United States
| | - Hong Yang
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana−Champaign, 114 Roger Adams Laboratory, MC-712, 600 S. Mathews
Avenue, Urbana, Illinois 61801, United States
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20
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Mistry H, Behafarid F, Zhou E, Ono LK, Zhang L, Roldan Cuenya B. Shape-Dependent Catalytic Oxidation of 2-Butanol over Pt Nanoparticles Supported on γ-Al2O3. ACS Catal 2013. [DOI: 10.1021/cs400888n] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- H. Mistry
- Department
of Physics, University of Central Florida, Orlando, Florida 32816, United States
| | - F. Behafarid
- Department
of Physics, University of Central Florida, Orlando, Florida 32816, United States
| | - E. Zhou
- Department
of Physics, University of Central Florida, Orlando, Florida 32816, United States
| | - L. K. Ono
- Department
of Physics, University of Central Florida, Orlando, Florida 32816, United States
| | - L. Zhang
- Center
of Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973-5000, United States
| | - B. Roldan Cuenya
- Department
of Physics, University of Central Florida, Orlando, Florida 32816, United States
- Department
of Physics, Ruhr-University Bochum, 44780 Bochum, Germany
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21
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Ono LK, Behafarid F, Cuenya BR. Nano-gold diggers: Au-assisted SiO(2)-decomposition and desorption in supported nanocatalysts. ACS NANO 2013; 7:10327-34. [PMID: 24215320 DOI: 10.1021/nn404744b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
An investigation of the thermal stability of size-selected Au nanoparticles (NPs) synthesized via inverse micelle encapsulation and deposited on SiO2(4 nm)/Si(100) is presented. The size and mobility of individual Au NPs after annealing at elevated temperatures in ultrahigh vacuum (UHV) was monitored via atomic force microscopy (AFM). An enhanced thermal stability against coarsening and lack of NP mobility was observed up to 1343 K. In addition, a drastic decrease in the average NP height was detected with increasing annealing temperature, which was not accompanied by the sublimation of Au atoms/clusters in UHV. The apparent decrease in the Au NP height observed is assigned to their ability to dig vertical channels in the underlying SiO2 support. More specifically, a progressive reduction in the thickness of the SiO2 support underneath and in the immediate vicinity of the NPs was evidenced, leading to NPs partially sinking into the SiO2 substrate. The complete removal of silicon oxide in small patches was observed to take place around the Au NPs after annealing at 1343 K in UHV. These results reveal a Au-assisted oxygen desorption from the support via reverse oxygen spillover to the NPs.
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Affiliation(s)
- Luis K Ono
- Department of Physics, University of Central Florida , Orlando, Florida 32816, United States
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22
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Abstract
The field of heterogeneous catalysis has received a remarkable amount of interest from scientific and industrial perspectives because of its enormous impact on the world's economy: more than 90% of chemical manufacturing processes use catalysts. Catalysts are also essential in converting hazardous waste into less harmful products (car exhaust) and in generating power (fuel cells). Yet in all applications, it remains a challenge to design long lasting, highly active, selective, and environmentally friendly catalytic materials and processes, ideally based on Earth-abundant elements. In addition, the field needs more satisfactory experimental and theoretical approaches to minimize trial and error experiments in catalyst development. Nanocatalysis is one area that is developing rapidly. Researchers have reported striking novel catalytic properties, including greatly enhanced reactivities and selectivities, for nanocatalysts compared to their bulk counterparts. Fully harnessing the power of nanocatalysts requires detailed understanding of the origin of their enhanced performance at the atomic level, which in turn requires fundamental knowledge of the geometric and electronic structures of these complex systems. Numerous studies report on the properties that affect the catalytic performance of metal naoparticles (NPs) such as their size, interaction with their support, and their oxidation state. Much less research elucidates the role played by the NP shape. Complicating the analysis is that the preceding parameters are not independent, since NP size and support will affect which NP shapes are most stable. In addition, we must consider the dynamic nature of NP catalysts and their response to the environment, since the working state of a NP catalyst might not be the state in which the catalyst was prepared, but rather a structural and/or chemical isomer that responded to the particular reaction conditions. In order to address the complexity of real-world catalysts, researchers must undertake a synergistic approach, taking advantage of a variety of in situ and operando experimental methods. With the continuous shrinking of the scale of material systems, researchers require more sensitive experimental probes and computational approaches that work across a wide range of temperatures and chemical environments. This Account provides examples of recent advances in the preparation and characterization of NP catalysts with well-defined shapes. It discusses how to resolve the shape of nanometer-sized catalysts via a combination of microscopy and spectroscopic approaches, and how to follow their evolution in the course of a chemical reaction. Finally, it highlights that, for structure-sensitive reactions, controlled synthesis can tune catalytic properties such as the reaction rates, onset reaction temperature, activity, and selectivity.
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Affiliation(s)
- Beatriz Roldan Cuenya
- Department of Physics, University of Central Florida, Orlando, Florida 32816, United States
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23
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Tuaev X, Rudi S, Petkov V, Hoell A, Strasser P. In situ study of atomic structure transformations of Pt-Ni nanoparticle catalysts during electrochemical potential cycling. ACS NANO 2013; 7:5666-5674. [PMID: 23805992 DOI: 10.1021/nn402406k] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
When exposed to corrosive anodic electrochemical environments, Pt alloy nanoparticles (NPs) undergo selective dissolution of the less noble component, resulting in catalytically active bimetallic Pt-rich core-shell structures. Structural evolution of PtNi6 and PtNi3 NP catalysts during their electrochemical activation and catalysis was studied by in situ anomalous small-angle X-ray scattering to obtain insight in element-specific particle size evolution and time-resolved insight in the intraparticle structure evolution. Ex situ high-energy X-ray diffraction coupled with pair distribution function analysis was employed to obtain detailed information on the atomic-scale ordering, particle phases, structural coherence lengths, and particle segregation. Our studies reveal a spontaneous electrochemically induced formation of PtNi particles of ordered Au3Cu-type alloy structures from disordered alloy phases (solid solutions) concomitant with surface Ni dissolution, which is coupled to spontaneous residual Ni metal segregation during the activation of PtNi6. Pt-enriched core-shell structures were not formed using the studied Ni-rich nanoparticle precursors. In contrast, disordered PtNi3 alloy nanoparticles lose Ni more rapidly, forming Pt-enriched core-shell structures with superior catalytic activity. Our X-ray scattering results are confirmed by STEM/EELS results on similar nanoparticles.
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Affiliation(s)
- Xenia Tuaev
- Technical University Berlin, Strasse des 17. Juni 124, 10623 Berlin, Germany.
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24
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Merte LR, Ahmadi M, Behafarid F, Ono LK, Lira E, Matos J, Li L, Yang JC, Roldan Cuenya B. Correlating Catalytic Methanol Oxidation with the Structure and Oxidation State of Size-Selected Pt Nanoparticles. ACS Catal 2013. [DOI: 10.1021/cs400234h] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Lindsay R. Merte
- Department of Physics, University of Central Florida, Orlando, Florida 32816,
United States
| | - Mahdi Ahmadi
- Department of Physics, University of Central Florida, Orlando, Florida 32816,
United States
| | - Farzad Behafarid
- Department of Physics, University of Central Florida, Orlando, Florida 32816,
United States
| | - Luis K. Ono
- Department of Physics, University of Central Florida, Orlando, Florida 32816,
United States
| | - Estephania Lira
- Department of Physics, University of Central Florida, Orlando, Florida 32816,
United States
| | - Jeronimo Matos
- Department of Physics, University of Central Florida, Orlando, Florida 32816,
United States
| | - Long Li
- Department
of Chemical and Petroleum Engineering, Department of Physics, University of Pittsburgh, Pittsburgh, Pennsylvania
15261, United States
| | - Judith C. Yang
- Department
of Chemical and Petroleum Engineering, Department of Physics, University of Pittsburgh, Pittsburgh, Pennsylvania
15261, United States
| | - Beatriz Roldan Cuenya
- Department of Physics, University of Central Florida, Orlando, Florida 32816,
United States
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25
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Bordiga S, Groppo E, Agostini G, van Bokhoven JA, Lamberti C. Reactivity of Surface Species in Heterogeneous Catalysts Probed by In Situ X-ray Absorption Techniques. Chem Rev 2013; 113:1736-850. [DOI: 10.1021/cr2000898] [Citation(s) in RCA: 488] [Impact Index Per Article: 44.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Silvia Bordiga
- Department of Chemistry and NIS Centre of Excellence, Università di Torino and INSTM Reference Center, Via P. Giuria 7, 10125 Torino, Italy
| | - Elena Groppo
- Department of Chemistry and NIS Centre of Excellence, Università di Torino and INSTM Reference Center, Via P. Giuria 7, 10125 Torino, Italy
| | - Giovanni Agostini
- Department of Chemistry and NIS Centre of Excellence, Università di Torino and INSTM Reference Center, Via P. Giuria 7, 10125 Torino, Italy
| | - Jeroen A. van Bokhoven
- ETH Zurich, Institute for Chemical and Bioengineering, HCI E127 8093 Zurich, Switzerland
- Laboratory for Catalysis and Sustainable Chemistry (LSK) Swiss Light Source, Paul Scherrer Instituteaul Scherrer Institute, Villigen, Switzerland
| | - Carlo Lamberti
- Department of Chemistry and NIS Centre of Excellence, Università di Torino and INSTM Reference Center, Via P. Giuria 7, 10125 Torino, Italy
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26
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Tupy SA, Karim AM, Bagia C, Deng W, Huang Y, Vlachos DG, Chen JG. Correlating Ethylene Glycol Reforming Activity with In Situ EXAFS Detection of Ni Segregation in Supported NiPt Bimetallic Catalysts. ACS Catal 2012. [DOI: 10.1021/cs3004227] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sarah A. Tupy
- Catalysis Center for Energy
Innovation, Department of Chemical and Bimolecular Engineering, University of Delaware, Newark, Delaware 19716, United
States
| | - Ayman M. Karim
- Institute for Integrated
Catalysis, Pacific Northwest National Laboratory, 902 Battelle
Boulevard, Richland, Washington 99352, United States
| | - Christina Bagia
- Catalysis Center for Energy
Innovation, Department of Chemical and Bimolecular Engineering, University of Delaware, Newark, Delaware 19716, United
States
| | - Weihua Deng
- Catalysis Center for Energy
Innovation, Department of Chemical and Bimolecular Engineering, University of Delaware, Newark, Delaware 19716, United
States
| | - Yulin Huang
- Catalysis Center for Energy
Innovation, Department of Chemical and Bimolecular Engineering, University of Delaware, Newark, Delaware 19716, United
States
| | - Dionisios G. Vlachos
- Catalysis Center for Energy
Innovation, Department of Chemical and Bimolecular Engineering, University of Delaware, Newark, Delaware 19716, United
States
| | - Jingguang G. Chen
- Catalysis Center for Energy
Innovation, Department of Chemical and Bimolecular Engineering, University of Delaware, Newark, Delaware 19716, United
States
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27
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Matos J, Ono LK, Behafarid F, Croy JR, Mostafa S, DeLaRiva AT, Datye AK, Frenkel AI, Roldan Cuenya B. In situ coarsening study of inverse micelle-prepared Pt nanoparticles supported on γ-Al2O3: pretreatment and environmental effects. Phys Chem Chem Phys 2012; 14:11457-67. [PMID: 22801490 DOI: 10.1039/c2cp41339f] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The thermal stability of inverse micelle prepared Pt nanoparticles (NPs) supported on nanocrystalline γ-Al(2)O(3) was monitored in situ under different chemical environments (H(2), O(2), H(2)O) via extended X-ray absorption fine-structure spectroscopy (EXAFS) and ex situ via scanning transmission electron microscopy (STEM). Drastic differences in the stability of identically synthesized NP samples were observed upon exposure to two different pre-treatments. In particular, exposure to O(2) at 400 °C before high temperature annealing in H(2) (800 °C) was found to result in the stabilization of the inverse micelle prepared Pt NPs, reaching a maximum overall size after moderate coarsening of ∼1 nm. Interestingly, when an analogous sample was pre-treated in H(2) at ∼400 °C, a final size of ∼5 nm was reached at 800 °C. The beneficial role of oxygen in the stabilization of small Pt NPs was also observed in situ during annealing treatments in O(2) at 450 °C for several hours. In particular, while NPs of 0.5 ± 0.1 nm initial average size did not display any significant sintering (0.6 ± 0.2 nm final size), an analogous thermal treatment in hydrogen leads to NP coarsening (1.2 ± 0.3 nm). The same sample pre-dosed and annealed in an atmosphere containing water only displayed moderate sintering (0.8 ± 0.3 nm). Our data suggest that PtO(x) species, possibly modifying the NP/support interface, play a role in the stabilization of small Pt NPs. Our study reveals the enhanced thermal stability of inverse micelle prepared Pt NPs and the importance of the sample pre-treatment and annealing environment in the minimization of undesired sintering processes affecting the catalytic performance of nanosized particles.
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Affiliation(s)
- J Matos
- Department of Physics, University of Central Florida, Orlando, Florida 32816, USA
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28
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Small MW, Sanchez SI, Marinkovic NS, Frenkel AI, Nuzzo RG. Influence of adsorbates on the electronic structure, bond strain, and thermal properties of an alumina-supported Pt catalyst. ACS NANO 2012; 6:5583-5595. [PMID: 22575058 DOI: 10.1021/nn3015322] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We describe the results of an X-ray absorption spectroscopy (XAS) study of adsorbate and temperature-dependent alterations of the atomic level structure of a prototypical, noble metal hydrogenation and reforming catalyst: ∼1.0 nm Pt clusters supported on gamma alumina (Pt/γ-Al(2)O(3)). This work demonstrates that the metal-metal (M-M) bonding in these small clusters is responsive to the presence of adsorbates, exhibiting pronounced coverage-dependent strains in the clusters' M-M bonding, with concomitant modifications of their electronic structures. Hydrogen and CO adsorbates demonstrate coverage-dependent bonding that leads to relaxation of the M-M bond strains within the clusters. These influences are partially compensated, and variably mediated, by the temperature-dependent electronic perturbations that arise from cluster-support and adsorbate-support interactions. Taken together, the data reveal a strikingly fluxional system with implications for understanding the energetics of catalysis. We estimate that a 9.1 ± 1.1 kJ/mol strain exists for these clusters under H(2) and that this strain increases to 12.8 ± 1.7 kJ/mol under CO. This change in the energy of the particle is in addition to the different heats of adsorption for each gas (64 ± 3 and 126 ± 2 kJ/mol for H(2) and CO, respectively).
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Affiliation(s)
- Matthew W Small
- School of Chemical Sciences and the Fredrick Seitz Materials Research Laboratory, University of Illinois, Urbana, Illinois, USA
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29
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Behafarid F, Cuenya BR. Nano Pinstripes: TiO2 Nanostripe Formation by Nanoparticle-Mediated Pinning of Step Edges. J Phys Chem Lett 2012; 3:608-12. [PMID: 26286156 DOI: 10.1021/jz300022c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
The present scanning tunneling microscopy study describes the high-temperature growth of TiO2 nanostripes with tunable width, orientation, and spacing, mediated by thermally stable micellar Pt and Au NPs deposited on TiO2(110). This phenomenon could not be explained by spillover effects but is based on the preferential stabilization of [11̅0] step edges on TiO2(110) by the metal NPs. Contrary to the behavior of physical-vapor-deposited NPs, which are known to move toward step edges upon annealing, our micellar NPs remain immobile up to 1000 °C. Instead, the mobility of TiO2 step edges toward the micellar NPs, where they become stabilized, is observed. Our findings are relevant to the technological application of nanostructured materials in the fields of catalysis, molecular electronics, and plasmonics.
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Affiliation(s)
- F Behafarid
- Department of Physics, University of Central Florida, Orlando, Florida 32816, United States
| | - B Roldan Cuenya
- Department of Physics, University of Central Florida, Orlando, Florida 32816, United States
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30
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Bonanni S, Aït-Mansour K, Harbich W, Brune H. Effect of the TiO2 Reduction State on the Catalytic CO Oxidation on Deposited Size-Selected Pt Clusters. J Am Chem Soc 2012; 134:3445-50. [DOI: 10.1021/ja2098854] [Citation(s) in RCA: 123] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Simon Bonanni
- Institute
of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL),CH-1015 Lausanne, Switzerland
| | - Kamel Aït-Mansour
- Institute
of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL),CH-1015 Lausanne, Switzerland
| | - Wolfgang Harbich
- Institute
of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL),CH-1015 Lausanne, Switzerland
| | - Harald Brune
- Institute
of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL),CH-1015 Lausanne, Switzerland
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31
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Shimizu KI, Kubo T, Satsuma A. Surface Oxygen-Assisted Pd Nanoparticle Catalysis for Selective Oxidation of Silanes to Silanols. Chemistry 2012; 18:2226-9. [DOI: 10.1002/chem.201103088] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2011] [Indexed: 11/09/2022]
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32
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Paredis K, Ono LK, Behafarid F, Zhang Z, Yang JC, Frenkel AI, Cuenya BR. Evolution of the structure and chemical state of Pd nanoparticles during the in situ catalytic reduction of NO with H2. J Am Chem Soc 2011; 133:13455-64. [PMID: 21790158 DOI: 10.1021/ja203709t] [Citation(s) in RCA: 97] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An in-depth understanding of the fundamental structure of catalysts during operation is indispensable for tailoring future efficient and selective catalysts. We report the evolution of the structure and oxidation state of ZrO(2)-supported Pd nanocatalysts (∼5 nm) during the in situ reduction of NO with H(2) using X-ray absorption fine-structure spectroscopy and X-ray photoelectron spectroscopy. Prior to the onset of the reaction (≤120 °C), a NO-induced redispersion of our initial metallic Pd nanoparticles over the ZrO(2) support was observed, and Pd(δ+) species were detected. This process parallels the high production of N(2)O observed at the onset of the reaction (>120 °C), while at higher temperatures (≥150 °C) the selectivity shifts mainly toward N(2) (∼80%). Concomitant with the onset of N(2) production, the Pd atoms aggregate again into large (6.5 nm) metallic Pd nanoparticles, which were found to constitute the active phase for the H(2)-reduction of NO. Throughout the entire reaction cycle, the formation and stabilization of PdO(x) was not detected. Our results highlight the importance of in situ reactivity studies to unravel the microscopic processes governing catalytic reactivity.
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Affiliation(s)
- Kristof Paredis
- Department of Physics, University of Central Florida, Orlando, Florida 32816, United States
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